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src/views/InstructorView.js

@@ -480,6 +480,18 @@ export function setupInstructorEvents() {
             const dashboardContent = document.getElementById('dashboard-content');
             const { subscribeToRoom } = await import("../services/classroom.js");
 
+            // Ensure challenges are loaded before rendering heatmap
+            if (cachedChallenges.length === 0) {
+                try {
+                    cachedChallenges = await getChallenges();
+                    console.log("Rejoin: Loaded challenges:", cachedChallenges.length);
+                } catch (e) {
+                    console.error("Rejoin: Failed to load challenges:", e);
+                }
+            } else {
+                console.log("Rejoin: Using cached challenges:", cachedChallenges.length);
+            }
+
             displayRoomCode.textContent = inputCode;
             localStorage.setItem('vibecoding_room_code', inputCode);
 
@@ -493,10 +505,17 @@ export function setupInstructorEvents() {
                 const users = Array.isArray(data) ? data : (data?.users ? Object.values(data.users) : []);
                 currentStudents = users; // Sync module-level variable
 
+                console.log("Rejoin: Received users:", users.length, users);
+                console.log("Rejoin: renderTransposedHeatmap available?", typeof window.renderTransposedHeatmap, typeof renderTransposedHeatmap);
+
                 if (typeof window.renderTransposedHeatmap === 'function') {
+                    console.log("Rejoin: Calling window.renderTransposedHeatmap");
                     window.renderTransposedHeatmap(users);
                 } else if (typeof renderTransposedHeatmap === 'function') {
+                    console.log("Rejoin: Calling local renderTransposedHeatmap");
                     renderTransposedHeatmap(users);
+                } else {
+                    console.error("Rejoin: renderTransposedHeatmap not found!");
                 }
             });
         } catch (e) {